.container { 
    max-width: 800px; 
    margin: 20px auto; 
    padding: 20px; 
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
} 

.input-container {
    display: flex;
    margin-bottom: 30px;
    background-color: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 1px 5px rgba(0,0,0,0.05);
}

input[type="text"] { 
    padding: 12px; 
    margin-right: 10px; 
    flex-grow: 1;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

input[type="checkbox"] {
    margin-right: 10px;
    width: 18px;
    height: 18px;
    cursor: pointer;
} 

button { 
    padding: 12px 20px; 
    background: #4CAF50; 
    color: white; 
    border: none; 
    border-radius: 4px;
    cursor: pointer; 
    font-size: 16px;
    font-weight: bold;
} 

button:hover {
    background: #45a049;
}

.todo-lists {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.todo-section {
    background-color: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 1px 5px rgba(0,0,0,0.05);
}

.todo-section h2 {
    margin-top: 0;
    color: #333;
    font-size: 18px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

ul { 
    list-style: none; 
    padding: 0; 
    margin: 0;
} 

li { 
    padding: 12px; 
    margin: 8px 0; 
    background: #f8f8f8; 
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid #4CAF50;
}

.todo-text {
    cursor: pointer;
    flex-grow: 1;
}

.completed .todo-text {
    text-decoration: line-through;
    color: #888;
}

#completed-list li {
    border-left: 4px solid #888;
    background: #f0f0f0;
}

.delete-btn {
    background: #f44336;
    padding: 5px 10px;
    font-size: 0.8em;
    margin-left: 10px;
}

.delete-btn:hover {
    background: #d32f2f;
}